When Is Backbiting Allowed in Islam?

Criticising someone in his presence or in his absence

If a person talks to himself about someone else who mistreated him, is that regarded as backbiting?

Causing an Engagement to be Called Off

“There is no backbiting in the Case of an Evildoer”

Is warning people about a man who is known to commit evil openly regarded as backbiting?

Relating a Story While Concealing Names

Cases in Which Ghibah (Backbiting) is Permitted

Expiation for Gossip

Listening to Others Backbiting